Effects of dispersal on local population increase

Citation
Jm. Kean et Nd. Barlow, Effects of dispersal on local population increase, ECOL LETT, 3(6), 2000, pp. 479-482
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
ECOLOGY LETTERS
ISSN journal
1461-023X → ACNP
Volume
3
Issue
6
Year of publication
2000
Pages
479 - 482
Database
ISI
SICI code
1461-023X(200011)3:6<479:EODOLP>2.0.ZU;2-K
Abstract
Work to date on biological invasions and the spread of biological control a gents has been focused on the explicitly spatial aspects, such as rate of s pread and shape of the wave front. There has Been relatively little attenti on paid to the influence of dispersal on the rate of increase of local popu lations. We use a simple general model for logistic local growth and one-di mensional diffusive dispersal to show that dispersal can act as a substanti al drain on local populations. Local increase at a site of introduction is always slower than would be expected in the absence of dispersal, while the rate of increase of other populations is initially enhanced, then reduced by dispersal. This may have an important effect when estimating population parameters for invading organisms or biological control agents during the i nitial stages of their spread, and helps explain the "latent period" typica lly observed in biological invasions.